Non-cracked concrete ≥ C20/25.. Natural stone with dense structure.Anchor bolt for push-through installation. When the hexagon nut is tightened, the tapered ;bolt is pulled into the expansion clip and ;expands it against the hole wall. ;Zinc plated steel version for indoor use. It can be used for fixing of ;Steel and wooden constructions.Suitable for-Non-cracked concrete ≥ C20/25.Natural stone with dense structure.. Anchor bolt for push-through installation. When the hexagon nut is tightened, the tapered ;bolt is pulled into the expansion clip and ;expands it against the hole wall. ;Zinc plated steel version for indoor use. It can be used for fixing of ;Steel and wooden constructions.. Suitable for-